cypher.cxx

pwlib源码库

/*
 * cypher.cxx
 *
 * Encryption support classes.
 *
 * Portable Windows Library
 *
 * Copyright (c) 1993-2002 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: cypher.cxx,v $
 * Revision 1.47  2005/01/26 05:37:57  csoutheren
 * Added ability to remove config file support
 *
 * Revision 1.46  2004/07/06 10:12:52  csoutheren
 * Added static integer o factory template to assist in ensuring factories are instantiated
 *
 * Revision 1.45  2004/06/29 12:22:22  rjongbloed
 * Fixed incorrect usage of result (now object rather than scalar), thanks Michal Zygmuntowicz
 *
 * Revision 1.44  2004/04/09 06:52:17  rjongbloed
 * Removed #pargma linker command for /delayload of DLL as documentations sais that
 *   you cannot do this.
 *
 * Revision 1.43  2004/04/03 23:53:09  csoutheren
 * Added various changes to improce compatibility with the Sun Forte compiler
 *   Thanks to Brian Cameron
 * Added detection of readdir_r version
 *
 * Revision 1.42  2004/03/23 05:59:17  csoutheren
 * Moved the Base64 routines into cypher.cxx, which is a more sensible
 * place and reduces the inclusion of unrelated code
 *
 * Revision 1.41  2004/03/14 10:03:47  rjongbloed
 * Fixed "security patch" that cleared entire object (including the vtable!) isntead of
 *   clearing the "sensitive" information it was supposed to clear.
 *
 * Revision 1.40  2004/03/02 12:08:27  rjongbloed
 * Added missing pragmas to automatically include libraries for OpenSSL
 *
 * Revision 1.39  2004/02/23 23:52:19  csoutheren
 * Added pragmas to avoid every Windows application needing to include libs explicitly
 *
 * Revision 1.38  2003/04/27 23:52:57  craigs
 * Fixed problem with SHA1 not calling Start
 *
 * Revision 1.37  2003/04/17 12:12:59  robertj
 * Added windows library inclusion for optional openssl.
 *
 * Revision 1.36  2003/04/17 07:34:46  robertj
 * Fixed correct test for P_SSL
 *
 * Revision 1.35  2003/04/17 01:21:55  craigs
 * Fixed problem with delete'ing a void *
 *
 * Revision 1.33  2003/04/10 07:14:27  craigs
 * Fixed link problem in MD5 class
 *
 * Revision 1.32  2003/04/10 06:16:09  craigs
 * Added SHA-1 digest
 *
 * Revision 1.31  2002/11/06 22:47:24  robertj
 * Fixed header comment (copyright etc)
 *
 * Revision 1.30  2002/06/05 12:29:15  craigs
 * Changes for gcc 3.1
 *
 * Revision 1.29  2001/03/01 03:55:59  robertj
 * Fixed MSVC warnings.
 *
 * Revision 1.28  2001/02/28 21:10:47  craigs
 * Fixed problem in Decode function
 * Added randomizer to fill data in Decode
 *
 * Revision 1.27  2000/02/17 12:05:02  robertj
 * Added better random number generator after finding major flaws in MSVCRT version.
 *
 * Revision 1.26  1998/11/30 04:50:45  robertj
 * New directory structure
 *
 * Revision 1.25  1998/09/23 06:21:56  robertj
 * Added open source copyright license.
 *
 * Revision 1.24  1998/07/24 06:58:13  robertj
 * Improved robustness of encrypted data decoding, error on illegal tail block size.
 *
 * Revision 1.23  1998/02/16 00:14:36  robertj
 * Fixed ability to register in one stage instead of always having to use 2.
 *
 * Revision 1.22  1998/01/26 02:49:14  robertj
 * GNU support.
 *
 * Revision 1.21  1997/10/30 10:19:19  robertj
 * Fixed bug with having empty string in encrypted text.
 *
 * Revision 1.20  1997/10/10 10:43:41  robertj
 * Fixed bug in password encryption, missing string terminator.
 *
 * Revision 1.19  1997/08/04 10:39:53  robertj
 * Fixed bug for decoding empty string.
 *
 * Revision 1.18  1997/07/26 11:35:38  robertj
 * Fixed bug where illegal data errors were not propagated.
 *
 * Revision 1.17  1996/11/16 10:50:26  robertj
 * ??
 *
 * Revision 1.16  1996/08/17 09:56:02  robertj
 * Fixed big endian processor platform conformance.
 *
 * Revision 1.15  1996/07/15 10:33:42  robertj
 * Changed memory block base64 conversion functions to be void *.
 * Changed memory block cypher conversion functions to be void *.
 * Changed endian classes to be memory mapped.
 *
 * Revision 1.14  1996/06/18 12:35:49  robertj
 * Fixed bug in registration when language is not English.
 *
 * Revision 1.13  1996/06/10 10:01:23  robertj
 * Fixed bug in getting cypher key, not copying all the bytes.
 *
 * Revision 1.12  1996/05/26 03:46:31  robertj
 * Compatibility to GNU 2.7.x
 *
 * Revision 1.11  1996/04/09 03:32:45  robertj
 * Fixed bug in registration so now works in time zones other than Eastern Australia.
 *
 * Revision 1.11  1996/04/08 05:18:38  robertj
 * Fixed bug in registering programs in a different time zone.
 *
 * Revision 1.10  1996/03/17 05:47:19  robertj
 * Changed secured config to allow for expiry dates.
 *
 * Revision 1.9  1996/03/16 04:37:20  robertj
 * Redesign of secure config to accommodate expiry dates and option values passed in security key code.
 *
 * Revision 1.8  1996/03/11 10:28:53  robertj
 * Fixed bug in C++ optimising compiler.
 *
 * Revision 1.7  1996/03/02 03:20:52  robertj
 * Fixed secured config parameters so leading/trailing blanks not significant.
 *
 * Revision 1.6  1996/02/25 11:22:42  robertj
 * Added assertion if try and SetValidation when not pending.
 *
 * Revision 1.5  1996/02/25 02:53:05  robertj
 * Further secure config development.
 *
 * Revision 1.4  1996/02/15 14:43:28  robertj
 * Allowed no secured config data at all to be "valid". All vars will then be guarenteed to default.
 *
 * Revision 1.3  1996/01/28 14:14:12  robertj
 * Further implementation of secure config.
 *
 * Revision 1.2  1996/01/28 02:49:00  robertj
 * Removal of MemoryPointer classes as usage didn't work for GNU.
 * Added the secure configuration mechanism for protecting applications.
 *
 * Revision 1.1  1996/01/23 13:05:58  robertj
 * Initial revision
 *
 */

#ifdef __GNUC__
#pragma implementation "cypher.h"
#endif

#define P_DISABLE_FACTORY_INSTANCES

#include <ptlib.h>
#include <ptclib/cypher.h>
#include <ptclib/mime.h>
#include <ptclib/random.h>



///////////////////////////////////////////////////////////////////////////////
// PBase64

PBase64::PBase64()
{
  StartEncoding();
  StartDecoding();
}


void PBase64::StartEncoding(BOOL useCRLF)
{
  encodedString = "";
  encodeLength = nextLine = saveCount = 0;
  useCRLFs = useCRLF;
}


void PBase64::ProcessEncoding(const PString & str)
{
  ProcessEncoding((const char *)str);
}


void PBase64::ProcessEncoding(const char * cstr)
{
  ProcessEncoding((const BYTE *)cstr, strlen(cstr));
}


void PBase64::ProcessEncoding(const PBYTEArray & data)
{
  ProcessEncoding(data, data.GetSize());
}


static const char Binary2Base64[65] =
            "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

void PBase64::OutputBase64(const BYTE * data)
{
  char * out = encodedString.GetPointer(((encodeLength+7)&~255) + 256);

  out[encodeLength++] = Binary2Base64[data[0] >> 2];
  out[encodeLength++] = Binary2Base64[((data[0]&3)<<4) | (data[1]>>4)];
  out[encodeLength++] = Binary2Base64[((data[1]&15)<<2) | (data[2]>>6)];
  out[encodeLength++] = Binary2Base64[data[2]&0x3f];

  if (++nextLine > 18) { // 76 columns
    if (useCRLFs)
      out[encodeLength++] = '\r';
    out[encodeLength++] = '\n';
    nextLine = 0;
  }
}


void PBase64::ProcessEncoding(const void * dataPtr, PINDEX length)
{
  if (length == 0)
    return;

  const BYTE * data = (const BYTE *)dataPtr;
  while (saveCount < 3) {
    saveTriple[saveCount++] = *data++;
    if (--length == 0)
      return;
  }

  OutputBase64(saveTriple);

  PINDEX i;
  for (i = 0; i+2 < length; i += 3)
    OutputBase64(data+i);

  saveCount = length - i;
  switch (saveCount) {
    case 2 :
      saveTriple[0] = data[i++];
      saveTriple[1] = data[i];
      break;
    case 1 :
      saveTriple[0] = data[i];
  }
}


PString PBase64::GetEncodedString()
{
  PString retval = encodedString;
  encodedString = "";
  encodeLength = 0;
  return retval;
}


PString PBase64::CompleteEncoding()
{
  char * out = encodedString.GetPointer(encodeLength + 5)+encodeLength;

  switch (saveCount) {
    case 1 :
      *out++ = Binary2Base64[saveTriple[0] >> 2];
      *out++ = Binary2Base64[(saveTriple[0]&3)<<4];
      *out++ = '=';
      *out   = '=';
      break;

    case 2 :
      *out++ = Binary2Base64[saveTriple[0] >> 2];
      *out++ = Binary2Base64[((saveTriple[0]&3)<<4) | (saveTriple[1]>>4)];
      *out++ = Binary2Base64[((saveTriple[1]&15)<<2)];
      *out   = '=';
  }

  return encodedString;
}


PString PBase64::Encode(const PString & str)
{
  return Encode((const char *)str);
}


PString PBase64::Encode(const char * cstr)
{
  return Encode((const BYTE *)cstr, strlen(cstr));
}


PString PBase64::Encode(const PBYTEArray & data)
{
  return Encode(data, data.GetSize());
}


PString PBase64::Encode(const void * data, PINDEX length)
{
  PBase64 encoder;
  encoder.ProcessEncoding(data, length);
  return encoder.CompleteEncoding();
}


void PBase64::StartDecoding()
{
  perfectDecode = TRUE;
  quadPosition = 0;
  decodedData.SetSize(0);
  decodeSize = 0;
}


BOOL PBase64::ProcessDecoding(const PString & str)
{
  return ProcessDecoding((const char *)str);
}


BOOL PBase64::ProcessDecoding(const char * cstr)
{
  static const BYTE Base642Binary[256] = {
    96, 99, 99, 99, 99, 99, 99, 99, 99, 99, 98, 99, 99, 98, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 62, 99, 99, 99, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 99, 99, 99, 97, 99, 99,
    99,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 99, 99, 99, 99, 99,
    99, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99
  };

  for (;;) {
    BYTE value = Base642Binary[(BYTE)*cstr++];
    switch (value) {
      case 96 : // end of string
        return FALSE;

      case 97 : // '=' sign
        if (quadPosition == 3 || (quadPosition == 2 && *cstr == '=')) {
          quadPosition = 0;  // Reset this to zero, as have a perfect decode
          return TRUE; // Stop decoding now as must be at end of data
        }
        perfectDecode = FALSE;  // Ignore '=' sign but flag decode as suspect
        break;

      case 98 : // CRLFs
        break;  // Ignore totally

      case 99 :  // Illegal characters
        perfectDecode = FALSE;  // Ignore rubbish but flag decode as suspect
        break;

      default : // legal value from 0 to 63
        BYTE * out = decodedData.GetPointer(((decodeSize+1)&~255) + 256);
        switch (quadPosition) {
          case 0 :
            out[decodeSize] = (BYTE)(value << 2);
            break;
          case 1 :
            out[decodeSize++] |= (BYTE)(value >> 4);
            out[decodeSize] = (BYTE)((value&15) << 4);
            break;
          case 2 :
            out[decodeSize++] |= (BYTE)(value >> 2);
            out[decodeSize] = (BYTE)((value&3) << 6);
            break;
          case 3 :
            out[decodeSize++] |= (BYTE)value;
            break;
        }
        quadPosition = (quadPosition+1)&3;
    }
  }
}


PBYTEArray PBase64::GetDecodedData()
{
  perfectDecode = quadPosition == 0;
  decodedData.SetSize(decodeSize);
  PBYTEArray retval = decodedData;
  retval.MakeUnique();
  decodedData.SetSize(0);
  decodeSize = 0;
  return retval;
}


BOOL PBase64::GetDecodedData(void * dataBlock, PINDEX length)
{
  perfectDecode = quadPosition == 0;
  BOOL bigEnough = length >= decodeSize;
  memcpy(dataBlock, decodedData, bigEnough ? decodeSize : length);
  decodedData.SetSize(0);
  decodeSize = 0;
  return bigEnough;
}


PString PBase64::Decode(const PString & str)
{
  PBYTEArray data;
  Decode(str, data);
  return PString((const char *)(const BYTE *)data, data.GetSize());